avcodec/atrac3: increase max block align size

Fixes decoding of lossy part of advanced lossless atrac3.
Regression since f09151fff9

libavcodec/atrac3.c

@@ -968,7 +968,7 @@ static av_cold int atrac3_decode_init(AVCodecContext *avctx)
         return AVERROR_INVALIDDATA;
     }
 
-    if (avctx->block_align > 1024 || avctx->block_align <= 0)
+    if (avctx->block_align > 4096 || avctx->block_align <= 0)
         return AVERROR(EINVAL);
 
     q->decoded_bytes_buffer = av_mallocz(FFALIGN(avctx->block_align, 4) +